what is the incident beam  it is the beam of light that exits the sample it is the beam of light is absorbed by the sample it is the initial beam of chemical energy that projected into the sample in a spectrophotometer  it is the beam of light that converts light energy into electrical energy in a spectrophotometer  it is the initial beam of light that is projected from the light source in a  spectrophotometer  -wich of the following researches described DNA as helical using X-ray diffraction studies.

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